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Find the sum of the first 140 positive even integers.
Find the sum of the first 140 positive even integers.
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Koala Tutor
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The first positive even integer is 2. The second positive even integer is 4. The third positive even integer is 6, and so on. The sum of an arithmetic series is equal to the average of the first and last term, multiplied by the number of terms, so the sum of the first 140 positive even integers is $(2 + 280)/2 \cdot 140 = \boxed{19600}$.
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